I am trying to declare a dynamic int
array like below:
int n;
int *pInt = new int[n];
Can I do this with std::auto_ptr
?
I tried something like:
std::auto_ptr<int> pInt(new int[n]);
But it doesn't compile.
I'm wondering if I could declare a dynamic array with auto_ptr
construct and how. Thanks!
No, you cannot, and it will not: C++98 is very limited when it comes to arrays, and auto_ptr
is a very awkward beast that often doesn't do what you need.
You can:
use std::vector<int>
/std::deque<int>
, or std::array<int, 10>
, or
use C++11 and std::unique_ptr<int[]> p(new int[15])
, or
use C++11 and std::vector<std::unique_ptr<int>>
(though that feels too complicated for int
).
If the size of the array is known at compile time, use one of the static containers (array
or an array-unique-pointer). If you have to modify the size at runtime, basically use vector
, but for larger classes you can also use a vector of unique-pointers.
std::unique_ptr
is what std::auto_ptr
wanted to be but couldn't due to the limitations of the language.
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